Core‐Protected Platinum Monolayer Shell High‐Stability Electrocatalysts for Fuel‐Cell Cathodes

More than skin deep: Platinum monolayers can act as shells for palladium nanoparticles to lead to electrocatalysts with high activities and an ultralow platinum content, but high platinum utilization. The stability derives from the core protecting the shell from dissolution. In fuel‐cell tests, no l...

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Veröffentlicht in:	Angewandte Chemie (International ed.) 2010-11, Vol.49 (46), p.8602-8607
Hauptverfasser:	Sasaki, Kotaro, Naohara, Hideo, Cai, Yun, Choi, Yong Man, Liu, Ping, Vukmirovic, Miomir B, Wang, Jia X, Adzic, Radoslav R
Format:	Artikel
Sprache:	eng
Schlagworte:	30 DIRECT ENERGY CONVERSION CATHODES core/shell particles DISSOLUTION ELECTROCATALYSTS fuel cells monolayers national synchrotron light source PALLADIUM PLATINUM STABILITY
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Beschreibung
Zusammenfassung:	More than skin deep: Platinum monolayers can act as shells for palladium nanoparticles to lead to electrocatalysts with high activities and an ultralow platinum content, but high platinum utilization. The stability derives from the core protecting the shell from dissolution. In fuel‐cell tests, no loss of platinum was observed in 200 000 potential cycles, whereas loss of palladium was significant.
ISSN:	1433-7851 0570-0833 1521-3773
DOI:	10.1002/anie.201004287